[Galaxy Tab Q&A, Help & Troubleshooting] Ichijoe:
Nightly's are Devloper - testing releases, while perfectly legit, they aren't know for their stability, and you may have to reckon with a broken Front Camera or broken Bluetooth support in such releases. However there are some good CM tweeked mods out there from other Devloper's such as Paranoid Android or Humberos that do work well enough. At least on GSM Models.

Without tolling Wiki to much. Eclair was the "Stock" ROM for the P1000 / Galaxy Tab when it came out back in 2010. It latter got an official Update to Gingerbread. So you could call these Android Codenames if you like. The next Codename after Gingerbread was Honycomb v3.xx But only came out with some Tablets. The real update to Gingerbread was Ice Cream Sandwich, then latter with Jelly Bean. The newest version is called Kit-Kat. Google likes their Junk Food it seems.

Like I was trying to say is that CM9 (ICS), has the Software Navigation Bar (Menu, Home, and Back Buttons) On the Screen. Which mirror those already on the Device. I'm unaware of how you deactivate this Navigation Bar without killing the OS. (i.e. It can't be done). That's why I recomend using a newer Jelly Bean ROM. As you'll at least have the option to turn this annoyance off. On those ROMs. Some ROMs make it simple others somewhat less so at first.

Again as to your Modem.bin File. You need to know which One is compatible with your Carrier. Chances are your installing the JPZ (GSM) Modem which is wrong for your CDMA Device. Looking at the Link I gave you. You only have the choice of the Sprint Stock Modem, or the Sprint EF17 Modem. Both need to be flashed to a CDMA Kernel w/Heimdall.

I would also suggest you go into the Google Play Store (assuming that you correctly installed a working GAPPs File), and download the GooManager. (or barring that find a link in this Thread! http://xdaforums.com/showthread.php?p=25943528. This should then allow you to "find" compatible ROMs for your P1/C/L/N etc... It should even be able to install those ROMs for you. Hopefully One of them will serve you well.

As for me I was just given my P1000 about Three Weeks ago, and I'm still looking for that One ROM that does everything. Sadly I still haven't quite found it, yet. But most of the CM10.1 Mods seem to be working ok. (i.e. Front Camera + Bluetooth are working!) You just have to keep looking.

As for playing Games on this thing I'll tell ya now forget it! with only 512Mb RAM you're not gonna be playing very much with it. Streaming Videos from my NAS Box, and from XBMC however works just fine! as does the updated Browsers and Chrome. ICS, and JB certainly look miles better then the Stock Gingerbread. when it comes to the DPI Resolution. Which becomes apparent if you ever try to use Google Music on it though GB. in Portrait Mode.

As to your USB Troubles did you ever try to install Samsung Kies yet? Samsung Kies has the Windows USB Drives needed to use your Device on your PC. Then again you should have also installed such Drivers already through Heimdall. But, it wont hurt to install Kies in any case. Just note that if you do use something like Heimdall or Oden to flash your Phablet, you need to make sure that Kies isn't running. Or else those Programs will NOT WORK!